Carved out by ice during several glaciations over the last two million years, this is the deepest lake in Australia and the headwaters of the Derwent River, upon which the capital city of Tasmania is located.

The area around Lake St Clair offers a wealth of walks, ranging from leisurely strolls to overnight bushwalks, as well as beautiful forests to explore. Lake St Clair is also the end point of the famous Overland Track, a long-distance walk which runs from Cradle Mountain in the north to Cynthia Bay on the southern shore of Lake St Clair.